Simultaneous electron capture and target ion excitation in collisions of C4+ and N5+ on He

Abstract

Abstract.Cross sections for simultaneous electron capture and target ion excitation have been measured for impact of stow He-like C 4+ and N s+ ions on He. The energy of the primary ion beams has been varied over more than two orders of magnitude: 0.05-7 keV/amu. The results are discussed on basis of a slightly modified version of the "dynamic" classical over-barrier model for multiple electron capture. The differences in the energy dependences of the experimental results of C 4÷ and N 5+ -He can be explained qualitatively by assuming that for N 5+ binding energy sharing between the two participating electrons is of importance, particularly at the lower impact energies.

State-selective electron-capture cross section measurements for low-energy collisions of He-like ions on H2

“…Table 5 gives the lifetimes and experimentally determined fractions [12]; --, Kumar and Saha [11]; ---, Errea et al [13]; -• • -, Fritsch [16]. Experiments: , Dijkkamp et al [17]; , Hoekstra et al [20]; , Panov et al [19]; , Crandall et al [18]; •, Soejima et al [21]; •, this work. of metastable states of interest in this work (for review articles see, e.g., [32][33][34][35]).…”

“…Charge-changing cross sections are also available from the work of Crandall et al [18] and Panov et al [19]. For C 4+ projectiles, we can directly compare our state-selective results with the earlier ones of Hoekstra et al [20] going down to an impact energy of 50 eV amu −1 . For this system Soejima et al [21] also measured charge-changing cross sections.…”

“…Theoretical calculations: -• -, Gargaud and McCarroll[12]; --, Kumar and Saha[11]; ---, Errea et al[13]; -• • -, Fritsch[16]. Experiments: , Dijkkamp et al[17]; , Hoekstra et al[20]; , Panov et al[19]; , Crandall et al…”

Dissociation of CO induced by ions: II. Dissociation pathways and states

“…Within the framework of the model it is assumed that ingoing to the collision the CO electrons subsequently transit the potential-energy barrier between the CO molecule and the He 2+ ion and move within the joint potential-energy well of the collision partners. The transitions occur at internuclear distances R in i and the binding energies of the transient (HeCO) 2+ molecular states are given by EM i [34], with i the index of the active electron. On the way out of the collision the active electrons, i.e.…”

Velocity and Charge State Dependences of Molecular Dissociation Induced by Slow Multicharged Ions

“…3(a) and 3(b), respectively. The width of the reaction windows are calculated as proposed by Hoekstra et al [18] for a collision energy of 4 keV͞amu.…”